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If you remain on French territory after your visa has expired, you run the risk of having to pay a fine and/or of having an alert recorded against you when you leave the French territory. In such a case, the consulate would process any further visa applications you may submit in the light of your overstaying the visa.

Consequently, if you consider that you are obliged to extend your stay in France after your visa has expired for reasons of force majeure, you must, before the date of expiry of your visa,

- submit an application for “prolongation de visa” (visa extension) with documentary evidence to the prefectural authority in your location ;

You say that you your ticket home is in December. Are you leaving from France to return home? I ask because you say "more months in Europe" and not France. If you want to stay in Europe but are not wedded to staying in France, you could leave France before your automatic 90 day stay for Schengen area countries expires and spend the rest of your trip in non-Schengen area countries like the UK and Croatia and non-EU European countries. Of course, you would have to check to see if they have visa requirements for Australian nationals. I know that Croatia does not have such a requirement. See http://croatia.visahq.com.au/.